. Engineering and Contracting . all would have to be carriedround the whole periphery of the reservoir,but a comparatively short length at eachend has proved to be sufficient. Outlet Works.—The outlet works are sit-uated at the north end of the dam, whichis made 14 ft. thicker at this point, and awell 10 by S ft., and a screen chamber 12 by3. ft., are formed in this thickened banks of the reservoir are cut away to allow easy accessof the water, and the slopes so formed are covered withgrouted pitching. The water passes from the reservoirthrough the screens which are of two kinds, t
. Engineering and Contracting . all would have to be carriedround the whole periphery of the reservoir,but a comparatively short length at eachend has proved to be sufficient. Outlet Works.—The outlet works are sit-uated at the north end of the dam, whichis made 14 ft. thicker at this point, and awell 10 by S ft., and a screen chamber 12 by3. ft., are formed in this thickened banks of the reservoir are cut away to allow easy accessof the water, and the slopes so formed are covered withgrouted pitching. The water passes from the reservoirthrough the screens which are of two kinds, the outer beingof iron bars spaced^to give 1 in. clear between them, and theinner ones of copper wire gauze having 400 metshes to theinner ones of copper wire gauze having -100 meshes to thewell is by four 12-in. bell-mouthed pipes each leading throughtwo sluice valves, in series, to a 15-in. upstand pipe. These12-in. pipes are at different levels to admit of the wateralways being drawn off near the surface. The supply pipe is. Fig. 2—Clear Water Tank and Engine House. taken through the dam from the lower end of the upstandand is 15 in. diameter through the dam, below which it isreduced to 12 in. diameter. In order to facilitate construction, a timber gantry 30 was built on the downstream side of the dam, the raillevel on the gantry being 15 ft. below the crest level of thedam. On the side of the gantry near the dam a 7-ft. crane (31) 756 Engincvi iuij and Contractinij for Jitiic 30, 19:^0. road was placed and on the farther side two lines of railsof 2-ft. gage, one for conveying the concrete from the mixerand the other for returning the empty trucks. Concrete Cistern and Aerator Cascades.—The raw waterfrom the reservoir passes through the draw-off main to aconcrete cistern 10 by 9 by 6 ft., the flow into which is reg-ulated by means of a ball valve fitted on the end of the pipeand capable of passing 750,000 gal. in 24 hours when fullyopen. There are two 6-in. outl
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
